"By 1941, most doctors recommended the diaphragm as the most effective method of contraception (Tone, 2001). But with the invention of the pill and the increased popularity of the IUD, the diaphragm and cervical cap fell out of favor during the 1960s. Diaphragms continued to be available but U.S. companies stopped producing cervical caps. When the early high-estrogen birth control pills and certain IUDs were found to cause medical problems, American women increasingly returned to using simple barrier methods that didn’t affect their hormones or menstrual cycles (Bullough & Bullough, 1990). Diaphragms became quite popular again, but the cervical cap had disappeared from the American scene (Chalker, 1987). The Food and Drug Administration approved the Prentif Cavity-Rim Cervical Cap for use in this country in May 23, 1988 ⎯nearly 60 years after it was introduced in the United Kingdom. Strenuous efforts by clinicians affiliated with feminist health centers had brought the cap back to America (Bullough & Bullough, 1990). But by 2002, the Prentif cervical cap was displaced in the marketplace by FemCap® (Cates & Stewart, 2004). Today, fewer than 0.01 percent of U.S women rely on diaphragms and caps for contraception (CDC, 2010)."